Answer:
13
Step-by-step explanation:
5-x+6=-2
X=13
Answer:
19
Step-by-step explanation:
In the first day the population will decrease to 1530, then 1500 the day 2, 1470 day 3, and so on ...
For decrease and get less than 1000 the mold population needs to be reduced in at least 560. The questions turns to be, how many days will it take to reduce the population in 560 spores?
If we divide 560 between 30 it will gives us the answer:
560/30 = 18.667
So, it is need to wait 19 days. In 18 days only 540 spores are reduced. In 19 days 570. We will say 19 days as we are looking (I guess) for an integer number.
Answer:
49
Step-by-step explanation:
The ratio of three numbers = 2:5:7
Then the numbers are 2x,5x and 7x
Given that the LCM of these numbers = 490
LCM of 2x,5x,7x is 2×5×7×x = 70x
Then, we have 70x = 490
x = 7
Hence, the numbers are 14, 35 and 49
Largest number = 49
∴The square root of the largest number = 7
Line up 136 and 212 with 136 on top and 212 on the bottom.
136
+212
____
now add up the end numbers, 6 and 2. That's 8. Since 8 is only a single-digit number, it fits in the space. Write that down under 6 and 2.
Next, add up the middle numbers, 3 and 1. That's 4, it fits in the space, so you don't need to regroup here either.
Now add up the first number in each, and that adds up to 3.
The sum is the number you wrote down! It should look something like this.
136
+212
____
348
You can say that the sum of these numbers is 348, and you did not have to regroup because the sums of each digit was under 10!
